- As an additional layer of defense, these disposable sleeve covers can be worn over clothing to shield your forearm from debris, spills, grime, powder pollutants, and particle barriers. while offering great comfort after hours of use. They are made of soft and durable plastic which is lightweight and comfortable to wear. These disposable sleeve coverings can be reused numerous times because they are not at all fragile. There are two ribbon rings on ends to prevent water from wetting your sleeves and to keep the cover in position. One size fits everyone and allows for easy and snug fit.